The document contains the presentation of the company Heidelberg Cement Romania S.A. and its activity for carrying out sustainable constructions. The company is present in our country since 1998, with investments of over 450 million Euro, holding the honorary title of „Supplier for the Royal House of Romania“.

STUDIES AND COMPARISONS OF WATERPROOFING MATERIALS FOR INFRASTRUCTURE PROTECTION

This article mainly illustrates the current situation of dedicated infrastructure materials as well as the comparison of some of them. For the waterproofing system comparison, one of the multi-criteria analysis methods was used: the Global Utility Method. The proposed analysis scenarios were: bituminous waterproofing for a continuous foundation, HDPE waterproofing for a continuous foundation and waterproofing based on additives for concrete, for a continuous foundation. Our multi-criteria analysis was based on the following features of the technology execution process: price, life span and degree of difficulty.

ANALYSIS OF LANDSLIDES THROUGH GEODETIC-TOPOGRAPHICAL METHODS AND 3D MODELING

The aim of the landslides study, located on the southern slope of the Cetățuie Hill (urban zone, Gruia neighbourhood, Cluj-Napoca City) is to create a geodetic-topographic plan and documentation that can be used specifically in planning and predicting erosion of slopes. In this study case was used the topographic documentation for hazard assessment of landslides. For the plan metrical and nivelitic surveying were used national geodetic network points of support supplemented with thickening points (due to work), in order to use them as starting and closing elements for determining the survey control In order to determine the points of land used for the survey network, a Pentax R – 322NX Total Station was used. Creating a 3D model from the data collected in the field was done using TopoLT and Surfer.

Concern about duration in which a building can be achieve, has been and remains one of the main problems of any specialist in this sphere of activity. Conception, design and implementation of a project require a constant monitoring the parameters of prediction, planification and supervision way works. Company management can be considered a discipline with economic character because its purpose is increasing economic efficiency

PRINCIPLES AND SYSTEMS CERTIFICATION OF BUILDINGS IN THE CONTEXT OF SUSTAINABLE DEVELOPMENT

The problem of constructing energy-efficient buildings and sustainable is increasingly present in recent years because their owners want to reduce energy consumption, carbon footprint reduction and maintenance costs. Created for this purpose or systems of assessment and certification of buildings in the context of sustainable development. The paper deals with the main building certification systems that are based on multi-criteria evaluation methodology following: raising awareness of the beneficiaries, design, construction, operation and promotion of integrated design practices.

This paper presents a study on how the occurrence and distribution of tensions casting a piece of „network contraction” or „yoke of contraction”. It makes a comparative analysis of the results provided by the aluminium alloy solidification simulation EN AC-Al Si7Mg0,3 cast in the mould of the classic mix of training and experimental results obtained by casting the play of the same alloy and in the same conditions and by cutting its determination tensions.

ADDITIVES MANUFACTURING A TECHNOLOGICAL

FUTURE IN MATERIALS PROCESSING BY CASTING

Material processing by casting requires the use of various types of raw materials, numerous auxiliary materials, various forms of energy and technological fluids flowing through varied route in several specific types of plant and machinery. The changes that have occurred in industrial technologies for the past 20 years under the new paradigm „changing technologies under the influence of the economic, social and political” and left their mark on the field for obtaining substantial and parts by processing materials by casting. Recent decades have marked the appearance in the current industrial operation in the processing of materials, concerns more highly bound to reduce and optimize energy consumption and materials linked with improving the environment. This development has led to the widening, deepening and broadening the scope in order of the best processing methods to ensure the sustainable development as on real. As such materials processing moulding consider key issues related to the technological side and those on the economic side, but also those that are imposed by increasing quality and minimizing environmental impact. Exploring the use of additive manufacturing system based on fundamental data, analyses, measurement and experimental results the scope of this article. This analysis leads to the idea of perspective as moulding materials processing has the potential to become a driving force to achieve a sustainable society by introducing efficient production practices that contribute to a considerable decrease negative environmental impact.

The present study was setup to determine the chemical composition of a bell material. After 27 years of service, a bell weighting 200 kg was broken. Two solutions were proposed for the repairing: soldering using Ag (cheap, but affecting the sound quality and mechanical properties) and a melting the old bell and casting a new one (approximately 16 times more expensive, but with better properties). An optical microscope Olympus GX51 was used to study the microstructure. The chemical composition was determined using an XRF device Olympus Delta Element. The analysis showed the presence of lead and tin in composition, close to the upper limits. The presence of lead and eutectic structure, and the porosity produced a large crack on the basis of the bell. Clusters of macro pores were observed near the surface of the bell. The fatigue could appear on the base of this

Helicoidally cylindrical surfaces are used for releasing surfaces of cutting tools the paper present aspects about experimental research of the kinematic coupling using different loads and different contact angle between roll and cylinder using a special developed for generation of the helical surfaces

The paper presents the results of the experiment cavitation vibrators, carried on carbon steel for general use UST 37-2, used in the manufacture of hydraulic turbine components, along the route of water flow into the turbine. Testing is performed on standard crystal vibrator device piezo ceramic of the Cavitation Laboratory of the University Politehnica Timisoara. OH12NDL comparison with standard steel and grey iron with pearlite structure shows that steel has low resistance to cavitation generated by the vibrator device, therefore not recommended in the manufacture of parts in areas of developed cavitation. Keywords: erosion, cavitation, carbon steel, average depth of erosion, erosion rate, vibrator device Cuvinte cheie: eroziune, cavitație, oțel carbon, adâncime medie de eroziune, viteza de eroziune, aparat vibrator

EXPERIMENTAL METHODS FOR TESTING OF THE ABRASIVE EROSION RESISTANT MATERIALS USED IN HYDRAULIC MACHINES MANUFACTURING

In the paper are reviewed the known methods applied to test the resistance of a metalic material to abrasive erosion with application to hydraulic machines espacially hydraulic pumps. Are mentioned the methods in the conformity with international standards. Article highlights the method which can be used to test and to measure the abrasive resistance of the materials used in the manufacturing of a hydraulic machine.

In the presents paper the author analyses the current state of superficial treatments with electromagnetic fields, in terms of the purpose and role within the manufacturing processes of parts and ways of energy generation and transmission parts to the surface. The author presents a technological solution suite which consists in the use of gas discharge lamps what emitting pulses of optical radiation for the surface treatment of parts. This solution thus extend the surface treatments with electromagnetic fields, constituting an alternative technology that are of interest to local selective surface hardening of machine parts and for the formation of protective film, cleaning and polishing surfaces.

TENSION AND DEFORMATION state at billet perforation for seamless pipes

The paper analyses the particularities of perforation through helical rolling of filled billets to achieve blanks for seamless pipes. Also, clarify the plastic flow phenomenon caused by the stress and strain state, which determine the formation of the cavity.

ELECTRICAL CONTACTS WITH HIGH DENSITY FOR STRONG CURRENTS, MADE BY POWDER METALLURGY

Electrical contacts for strong currents by infiltration after sintering, was not satisfactory because the final density is much higher (11,100 kg/m3) and porosity is much lower (10.85 %). The infiltration after sintering contains: powder mixture preparation (W – 52 mass %, Ni – 2 %, Cu – 46 %, zinc stearate – 0,7 % – 7 g), homogenization, pressing (4,5 MPa), sintering (730 and 780 oC). The green density is almost constant, with an identical porosity of the first after the end of the process (14,28 %). By infiltration the density increased drastically (10,832 kg/m3), its variations were increased also and porosity decreased (at 10.85 %). The attained density is not sufficient for electrical contacts work (11,100 kg/m3), but it is closer. Way to improve density: pressing, sintering, and repressing (10,700 kg/m3).

The paper analyses the Mannesmann process of blanks rolling into pipes of a certain wall thickness and diameter. Also, is focuses on pipes finishing in the size range of 400-900 mm for the exterior diameter, used for gas and petroleum products transportation.

The brazing between nickel and aluminium plates is a very sensible process being influenced by type of used materials and by brazing devices which maintain in contact the metal plates. These brazing devices have a very important purpose, their pressure affect directly the capillarity force. If the brazing devices are too tight (like 7 bar pressure), the filler melted metal escape from the grip, causing presence of defects in the joint; if the brazing devices are not tight enough (like 5 bar pressure) the capillarity forces become weak, allowing the voids inside the joint. Therefore, it’ is optimal for a nickel-aluminium brazed joint without defects a 6 bar pressure, created by brazing devices,

RESEARCH AND EXPERIMENTATION ON OPTMIZING REGIME FOR WELDING COMPONENTS WITH

GRADIENT METHOD

The paper presents the calculation algorithm and the optimal solution calculated gradient method, an experimental program conducted on board the components of arc welding in the environment of protective gases. Welding regime parameters on variation conclusions have been drawn, then the gradient method was chosen optimum welding regime.

STUDY ON DEVELOPING IN NETWORK OF A NEW PRODUCT IN CUTTING TOOLS FIELD

This study describes patterns of a flexible working structure that allow researchers to react quickly to the environment, to move towards the market, to meet the needs of citizens, to assimilate and process new information in a timely manner, to be innovative and find new solutions. Designing and running a project from an idea, theme, until the prototype imposes complex requirements of the project team in general and project director/project manager – in particular.

Based on the structure of a technological device with applicability in mini and micro parts manufacturing industry, will present the transformation of a conventional mechanism into a compliant device. First part of the paper will bring in front the main notions from the technological device field, later on the description and the design of a compliant gripping device. This paper will continue with the simulation, device analysis and finally some conclusions to be made and future directions of the research.

Current paper refers generally to the mesh quality verification technology of worm-face gear drives with localized contact, specifically investigating gear drives kinematic precission, as well as teeth contact pattern, as practical methods of evaluation of their quality in exploitation. Experimental results, related to this technology are illustrated through practical examples, for some particular gear drives, subject of this investigation.

This paper present the results of theoretical researches by simulation with regard to the means to optimise the dynamic behaviour of a CNC laser cutting machines, and especially of the components of the kinematic feed chain in terms of cutting precision. The simulation results are presented both for the case of absence and for the case of the presence of technological forces as disturbance factors.

This paper appeared as a necessity, so should students who want to learn how to operate the CNC lathe and CNC milling machine. Training is performed using a program „Soft Swan” (a trial version), which we call simulator. Simulator has an interface composed of elements compatible Windows and virtual image of the machine (lathe or milling machine). The paper presents two common errors due haste, inattention and \ or inexperience.

The present work, describe a G-Code programming for a 3D Computer Aided Design. The main program contains four sets of programs, written in chronological order, needed of piece processing operations. The case study proposes in this paper show that through a dedicated software ArtCAM package, we can wood surface from 2D to 3D. G-Code Program contains all operations to engraving by milling the selected text wooden on the plate.

The implementation of modern production systems has become a necessity due to global competition and aims a better response to customer requirements, improve quality, decrease delivery times and costs. This paper aims to implement Heijunka method for increasing the performance of a production process within an automotive company in Sibiu. By implementing the method desired volumes leveling to balance inventories and customer demand.

Current context of energy production, the overall situation of the environment affected by hazardous emissions generated by internal combustion engines and not least prices are favouring cheaper fuel production from renewable sources The first step for obtaining bioethanol is represented by agricultural production. The paper is exploring how the cultivation conditions influence the crop levels and the economic efficiency of a corn crop in order to process it for bioethanol production.

In this project will present its importance and benefits of bread and others bakery products. We chose this theme because the bakery industry occupies a very important place in the food, bread is a staple food in human nutrition.

THE VARIABILITY OF MORPHOMETRICAL ELEMENTS FEATURES COMMON DEER TROPHIES IN THE CATCHMENT GURGHIU

The stag (Cervus elaphus) is one of the most important species in our hunting ground areas. In the socio-economic context of our country, the common deer populations have a great significance taking into consideration both the financial benefits obtained by practicing hunting and its important niche role in the mountain and pre-mountain ecosystems. In present paper we have studied the variability of the morphometric characters of stag trophy at different ages. In order to achieve the proposed objectives, the carried out study analysed a number of 29 trophies.

The assessment of trophies was made by applying the CIC methodology and by respecting all rigors related to characters measuring and use of tools.

The data were statistically processed by calculating the variance, coefficient of variation and establishing the correlations between the morphometric characters and exposing the regression equations of these correlations.

The authors intend to study how the human bio-field responds at a nonphysical stimulus. More precisely, what happens when a person, using special techniques, retire the energy from the exterior of the body through the interior, for 2-3 minutes? The authors find out that this procedure was interpreted by the energetic body as an aggression leading to a state near illness. The subject stopped his actions, not to create damages to the entire human being which could eventually require a treatment. A very important observation of the authors is that during the experiment it was noticed a tendency of hysteresis for the human being, phenomenon which the authors decided to study in the future.

FRACTALS – PHILOSOPHY BETWEEN RESEARCH AND MATHEMATICS. APPLICATIONS IN FLUID MECHANICS

This paper wants a foray into the world of fractals and how to discover the beauty of pure mathematics and hidden connections that it has with the world around us. Also described Fractal Vision appropriate software with which it enters the fantasy world of fractal geometry.

The paper presents a contribution to the aerodynamic body of revolution movement trajectories in the thin atmosphere. As a particular case, the paper refers to flying projectiles and missiles, to customize linarite stationary movements around thin bodies of revolution.

THE CALCULUS OF THE CONTRACTION COEFFICIENT OF AN ORIFICE AND THE GRAPHYCAL RESULTS REPRESENTATION WITH SIGMA PLOT PROGRAMME

This paper presents the continuation of the studies from the last two articles presented at the last two Sebeș conferences. The authors used the same numerical method to integrate the Navier-Stokes equations and the presentation is done this time using a Sigma Plot programme. The study is performed with a combination of symmetric and asymmetric orifices at the same Reynolds number. The authors used again the method of finite differences to determine the flow through a tank and through the contracted section of the liquid passing an orifice.

The paper presents the design restrictions of fish ladders mentioned in the literature and highlights through an example of how sizing calculation of these structures taking into account the hydraulic flow regime.

This paperwork studies the efficiency of the liquid controllers with a ring valve analysing the liquid running through the controller, the variation of the pressure and its speed for various forms of the ring valve controller.

Attachment of the wind turbine rotor blade is made by a metal structure, that provides a rigid mounting and precise positioning as accurate as possible to the calculated direction angle of incidence of the air flow relative to the blade profile sections. The mechanical strength at static load for the blade is within acceptable limits even without metal insert. In real operating conditions, the wind gusts have the effect of a dynamic load upon the blade and the base material, fiberglass reinforced polyester (FRP) is subjected to fatigue stressed. This leads to micro cracks in the resin and gradually reaches the blade breakage. Therefore the recessed fitting area of the blade, which is an aerodynamically inactive area, must have a metal structure with maximum adhesion to FRP of the blade structure. The shape of this structure, the way of insertion into the interior of the blade, the depth of penetration, are issues which will be discussed in this paper.

MODELING OF A WIND TURBINE BLADE BASED ON MAXIMUM LIFT FORCE AT VARIABLE WIND VELOCITIES

This paper presents a new solution in the wind turbine blade modelling, based on a new concept of the maximum lift force, capable to be produced at different values of wind velocities. First are mentioned some atmospheric registered parameters into the selected area of future implementation of such wind turbine. Further some theoretical aspects are briefly mentioned, followed by the obtained results. Finally some conclusions and remarks are mentioned.

This paper presents the concepts of maintenance and especially the maintenance of onshore wind turbines. There are several types of maintenance, each of them trying to reduce the costs with repairs of wind turbine and also the losses of energy production.

There are presenting a new way to increase the pumping efficiency in many pumping station, concerning in pumps working service life optimization. This objective is rational according to the demand to not make inopportune investments (premature or expensive) by replacing or rehabilitating less used pumps. Other reason is to minimize or eliminate, as it possible, to keep on function massive used pumps with low efficiency.

THE ADVANTAGES, ERRORS AND LIMITATIONS OF INFRARED THERMOGRAPHY METHOD USED TO THE MAINTENANCE OF HYDRAULIC DRIVE SYSTEMS

The subject of the article is to discuss the advantages, errors and limitations of infrared thermography which can be used as a non-invasive modern method of diagnosis even in industrial applications. The method of infrared thermography diagnosis is proposed to be applied in the preventive maintenance of hydraulic drive systems.

The paper analyses the hydro generators stator stability, based on the problems that occurred during the operation of the Romanian power plants. In order to highlight the stator components role in these problems, it is analysed the stability of the stator housing and hydro operation found in samples and tests hydro Power Plant No. 1 hydropower from Great River Retezat, where the curvature of the stator creates vibration and instability in operation. The stability of the stator in this case can be obtained by an adequate construction of the building system of the winding heads to prevent any movement of the coils during operation of the hydro. Hydro generator stator is conditional stability dynamic stability of the metal housing because the stator housing design and construction of a great height without adequate consolidation creates problems of vibration and dynamic stability housing.

DESIGN AND DESCRIPTION OF AN DRIVE AND REGULATION SYSTEM AT A CROSS-FLOW MICROHYDROTURBINE

This paper presents beside the practical concepts, also theoretical calculation to establish and define basic design of a drive and regulation system used regularity to micro-hydro turbine, specifically Cross-Flow. Virtual 3D designed are most modern models solutions and hydraulic drawing was used with success to achieve physical models by execution drawings.

DETERMINATION OF THE ACTUAL OPERATING PARAMETERS OF THE HYDRO UNITS OF A LOW HEAD HYDRO POWER PLANT

The paper presents the flow rate calculation and measurement methodology for a high flow/low head hydro power plant with upstream cofferdam recesses.

At the same time, the paper presents the results of the in situ measurements of the actual operating parameters of the hydropower units, especially of the flow rate measurements carried out on the hydropower units’ no.1 and no. 2 of Robeşti HPP. The measurements have been carried out in agreement with the provisions of CEI 41/1991 [4].

AUTONOMOUS MICRO-HDYRO POWER PLANT BEHAVIOR ON WATER THREAD OR WATER DIVERSION

This work presents the requisites for a micro hydro power plant located on a water thread or on the water branch, where the water flow determines the speed of and, implicitly, the power supplied by the synchronous tri-phased generator with self-excitation. Such a micro hydro power plant functions depending on the water flow capacity and water fall given by the penstock. The low-voltage electric energy produced by this plant is transported to the consumer through an underground power cable. The command and control of the micro hydro power plant can be automated, the sole human intervention being the opening and the close of an intake valve.

Tourism development is important for local communities mostly because it brings opportunities for economic growth, but it can also be a threat for changing the environment or the social life. The article aim is to determine the attitude of local residents from Turda towards the tourism development from their city after the Salt Mine, the most important tourism attraction, was modernized and attracted a high number of visitors. A survey was conducted among the sample population from Turda County. Results indicate that the locals have usually a positive perception regarding tourism development, but there are no particular signs that this led to a significant change in their daily lives.

„Bird Strike Prevention Systems” is defining the integrated concept of aircrafts protection at the strike with the bird and it contains measures that are taken for airplanes and also for airports. The bird strike is a dangerous and also common event, which happens often at ground or low altitude, the dangerous phases of landing/take-off. The bird strike can provoke light damage but it can also provoke engine malfunction leading to stop, with obvious consequences for the flight safe.